Wire Handling for Vehicle Glazing Panel Cut Out

ABSTRACT

A dispensing system for dispensing cutting wire to be used in a glazing panel cut out procedure has a mounting device with a docking station for docking a wire store device. The wire store device mounts on the docking station in order to dispense the wire. The mounting device can have a rotary means operable to pay out cutting wire from the system. The rotary means is controllable to adjust the applied torque required to operate the rotary means.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No.13/579,064, filed Oct. 22, 2012, which is a national stage entry ofinternational application Ser. No. PCT/GB2011/050299, filed Feb. 16,2011, which claims priority from United Kingdom application Serial No.GB 1002856.1, filed Feb. 19, 2010, all of which are hereby incorporatedby reference herein in their entireties.

BACKGROUND

1. Field

The present invention relates to wire handling for vehicle glazing panelcut out techniques.

2. State of the Art

Vehicle glazing panels such as vehicle windscreens (windshields) aretypically bonded in supporting frames by adhesive bonding material suchas polyurethane, applied in a continuous bead about the periphery of theglazing panel and frame.

Wire cutting techniques have been previously proposed and used to effectglazing panel removal (for replacement or otherwise). Exemplarytechniques are disclosed in, for example, EP-A-0093283, Canadian PatentSpecification 2034221, U.S. Pat. No. 6,616,800, German Patent 4012207and PCT Publications WO2006/030212, WO86/07017 and WO98/58779.

SUMMARY OF THE INVENTION

An improved technique and apparatus has now been devised which aids incutting out a windscreen by having a dispenser unit for dispensingcutting wire the dispenser having means for mounting to the glazingpanel and enabling cutting wire to be payed out from the dispenserwhilst mounted to the glazing panel during the cut out procedure. A wirewinder unit is typically mounted on the windscreen, the winder unitincluding one or more winder spools. The winder unit may be moved aboutthe screen between several mounted positions with separate respectivecuts being effected at the different mounted positions.

When the setting a wire dispenser unit is initially set on thewindscreen, the cutting wire may be looped about the periphery of theglazing panel and a free end of the wire payed out from the dispensermay be connected to the winder spool of the winder unit.

Typically the winder spool of the winder unit is operated to wind thewire and thereby cut the bonding material, wherein during cutting wireis payed out from the dispenser unit in order to effect slip cutting ofthe bonding material.

According to a first aspect, the present invention provides a dispensingsystem for dispensing cutting wire to be used in a glazing panel cut outprocedure, the system comprising;

-   -   a mounting device arranged to be mounted on a glazing panel, the        mounting device being provided with a docking station for        docking a wire store device; and    -   a wire store device arranged to be mounted on the docking        station in order to dispense wire; the wire store device being        demountable from the docking station.

Considered alternatively the invention provides a dispensing system fordispensing cutting wire to be used in a glazing panel cut out procedure,the system comprising a mounting device arranged to be mounted on aglazing panel, the mounting device being provided with a docking stationconfigured for demountable docking of a wire store device.

Beneficially, the docking station is provided with rotary means operableto pay out cutting wire from the wire store device.

It is preferred that the rotary means is controllable to adjust theapplied torque required to operate the rotary means. Adjustable brakemeans may be provided for this purpose, preferably being operable toadjust the applied torque required to operate the rotary means.

In one embodiment, the adjustable brake means preferably comprises afriction brake which is tightenable to increase the braking effect, orrelaxable to reduce the braking effect.

It is preferred that the rotary means comprises a rotary device to whichthe wire store device is arranged to be coupled in docked demountableengagement.

In a preferred embodiment, when in docked engagement a spool of thestore is coupled for rotation with the rotary device.

In certain embodiments it may be preferred that the store device has acentral aperture for accommodating the rotary device in dockeddemountable engagement.

The docking station and the wire store device may beneficially beprovided with respective complementary engaging docking formationsarranged to engage when the wire store is docked with the dockingstation.

In a preferred realization, the engaging docking formations are arrangedto permit the store to be mounted and demounted from the docking stationbut ensure that the store and docking station are coupled for rotationtogether in unison when in the docked configuration.

Where adjustable brake means is utilized this may beneficially beoperated by a cam and lever arrangement.

In a preferred embodiment, the mounting device for securing on theglazing panel comprises a suction mount.

According to an alternative aspect, the invention provides a dispensingsystem for dispensing cutting wire to be used in a glazing panel cut outprocedure, the system comprising a mounting device arranged to bemounted on a glazing panel, the mounting device being provided withrotary means operable to pay out cutting wire from the system, whereinthe rotary means is controllable to adjust the applied torque requiredto pay out the cutting wire.

In a preferred realization, the system includes adjustable brake meansoperable to adjust the applied torque required to operate the rotarymeans.

The adjustable brake means may comprises a friction brake which istightenable to increase the braking effect or relaxable to reduce thebraking effect.

The rotary means may comprise a rotary device to which a wire storedevice is arranged to be coupled, the system including adjustable brakemeans engaging with the rotary device (preferably at an interfaceperpendicular to the rotational axis of the rotary device) and operableto adjust the applied torque required to operate the rotary device.

According to a further alternative aspect, the invention provides a wirestore device for storing cutting wire for dispensing, the store devicecomprising:

-   -   an annular housing having an annular base and an arcuate        upstanding outer wall extending upwardly from the base, the        arcuate upstanding outer wall extending around the annular base        between terminal edges of the wall such that a gap is defined in        the outer wall; and    -   an annular spool body member received nested internally of the        arcuate upstanding outer wall of the annular housing, the        annular housing and annular spool body being retained relative        to one another such that relative rotation between the annular        housing and annular spool body is facilitated.

It is preferred that an inner cylindrical wall for the store device isprovided by an inner cylindrical wall of the annular spool body.

The annular spool body member may, in a preferred embodiment, bereceived nested internally of the arcuate upstanding outer wall of theannular housing by means of formations (preferably snap fit engagementformations) that prevent separation of the spool body out of nestedengagement with the housing but permit relative rotation between theannular housing and annular spool body.

In a preferred embodiment the inner cylindrical wall of the device(preferably the inner cylindrical wall of the spool body) may beprovided with formations permitting the wire store device to be rotarycoupled to a rotary means operable to pay out, or draw in, cutting wire.

The invention will now be further described in a specific embodiment byway of example only and with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic plan view of a winder unit of an exemplary cut outsystem in accordance with the invention;

FIGS. 2 to 4 are schematic representations in sequence of a cut outtechnique;

FIGS. 5 to 8 are schematic perspective views of a wire store deviceaccording to the invention;

FIGS. 9 to 11 are schematic perspective, plan and sectional viewsrespectively of a wire dispensing system in accordance with theinvention;

FIG. 12A is a schematic side view of the wire dispensing system of FIGS.9 to 11;

FIG. 12B is a plan sectional view of the wire dispensing system of FIG.12A for the section A-A shown in FIG. 12A;

FIGS. 13 to 15 are schematic perspective, plan and sectional viewsrespectively of a wire dispensing system in accordance with theinvention, loaded with a wire store device according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the drawings, and initially to FIGS. 1 to 4, there is showna cut out system particularly for use in cut out of bonded vehicleglazing panels such as windscreens. The cut out system comprises awinder unit 1 and a wire dispenser unit 2.

The winder unit 1 comprises a pair of releasable suction cup mounts 10,11 enabling the winder unit to be releasably secured to the windscreen.The suction cup mounts comprise a rigid plastics cup 12 and underlayingflexible rubber skirt membrane 13. Respective actuation/release levers14 enable consistent suction to be applied and released. Such suctionmounts are commonly employed in windscreen replacement and repairtechnology. The suction cup mounts 10, 11 are pivotably/tiltably mountedto the support bracket 15 of the winder unit to ensure that both mounts10, 11 can locate in good engagement with the windscreen despite thecurvature of the windscreen. The main body of the support bracket 15carries a pair of underslung winding spools 4, 5 in side by siderelationship. The spools are connected to axial winding shafts which aresupported in bearings 16, 17 provided on the winder unit. The spools 4,5 are driven axially rotationally either manually via a hand winder orby means of a mechanical actuator such as a motorised winding orwinching tool.

Drive bosses 18 are provided with female sockets 19 (square bores) forreceiving the male driving tool. Positioned outwardly of the windingspools are respective wire guide pulley wheels 8, 9 of low frictionplastics material. The pulley wheels are mounted to be rotatable aboutrespective rotational axes. The guide pulleys rotate as the cutting wireis drawn tangentially across the pulleys as will be described. Thewinder spools 4, 5 are held to rotate in one direction only (each inopposite senses) by respective ratchet mechanisms. Each mechanismincludes ratchet override permitting prior tightened wire to beslackened, or unwound (reverse wound).

The winder unit 1 is secured internally of the vehicle to the surface ofthe glazing panel 3 above the steering wheel as shown in FIG. 2. A wirestore which also acts as a dispenser spool 2 is secured to the exteriorsurface of the glazing panel 3 and the wire 41 is wrapped around theexternal peripheral edge of the glazing panel staring at corner A andproceeding to corners B C and D. The wire subsequently passes adjacentthe lowermost edge of the screen (from D toward A) where a free end ispulled through an aperture made in the PU bonding bead at the corner A,such that the free end of the wire can be attached to winder spool 5. Anadhesive tape patch 6 is secured to the screen over the wire. Thedispenser spool 2 includes a sucker mount 2 a and an internal wiredispenser cartridge which is free to rotate in a housing so as to payout wire from the dispenser spool as tension of a required magnitude isput upon the wire. The adhesive tape patch is used to give resistance topaying out of the wire from the spool. Other brake devices (typicallyresistance or friction providing devices may be used in addition to oras an alternative to the adhesive patch 6).

Removal is commenced by winding the spool 5 to move the cut from thecorner A upwardly along the side edge and around corner B. Duringcutting, if excessive resistance occurs, from tough or large PU adhesivebeads, the wire is able to spool off the dispenser spool 2 and slip andslice past the PU adhesive in what can be referred to as ‘slip cutting’.The use of the spool dispenser mounted on the windscreen enables this‘slip cutting’ to occur early in the cut out procedure and withoutpre-cutting of the other free end of the wire 41. Once the cutting wire40 has travelled around the corner B, the winder unit 1 is moved acrossthe windscreen to the other side and re-secured to the windscreen in theconfiguration shown in FIG. 3. Prior to repositioning the unit 1, theratchet of winder spool 5 is released to permit the wire to be wound outfrom the spool 5 as it is moved across the glazing panel to berepositioned. The ratchet is subsequently re-engaged and spool 5 onceagain operated to wind in the wire.

When the cut has almost been completed along the top edge, the winderunit is rotated through 90 degrees and re-secured as shown in FIG. 4.The cut is then progressed such that the cut position passes around thecorner C. The adhesive tape 6 is next removed and enough wire is payedout from the dispenser spool 2 to reach and be wound on the winderspool. The measured length of wire is then cut from the dispenser spooland the cut free end is pulled into the vehicle either by prising outthe already released corner of the windscreen to form a small gap, orinsertion of the free wire end through the pre-formed hole in the PUbonding material at corner A. The free end of the wire 41 is thenconnected to the spool 4 (passing around pulley 8). The winder spool 4is then operated to wind in the wire, in so doing cutting along thebottom edge.

The wire store/dispenser device 50 according to the present invention isshown in FIGS. 5 to 10 and provides advantages over the store/dispenserdescribed above.

The store/dispenser device 50 as shown in FIG. 5 comprises an annularouter sleeve or housing 51 and which receives, seated therein, a spoolbody 52 upon which wire is wound. The spool body 52 and outer sleevehousing 51 are assembled to be rotatable relative to one another. Thespool body is shown in isolation in FIG. 7. The sleeve housing 51 isshown most clearly in FIG. 6 and can be seen to have an annular base 53and an upstanding outer wall 54 which extends most of the way around theperiphery of the device 50 but is provide with terminal upright edges 5556 defining a peripheral opening devoid of the wall 54. An innercircumferential upstanding lip 57 extends all around the central void 58of the sleeve 51. Towards the upper rim 59 of the peripheral upstandingwall 54 there is a shoulder 60 between the upper radial inner surface 61of the wall 54 and the lower radial inner surface 62 of the wall 54. Thesurface 61 is spaced radially outwardly of the surface 62. A series ofclip projections 63 are spaced around the upper radial inner surface ofthe wall. A stop tab 64 is provided projecting radially outwardly fromthe outer surface of the wall 54.

As shown in FIG. 7, the wire spool body 52 has an upper surface 64, anupper flange 66 just below the upper surface 64, the upper flange 66extending radially outwardly. The item 52 also has a bottom flange 65and a recessed annular wall 67 upon which the wire is wound. In order toassemble the device 50 the spool body 52 is pushed downwardly into thesleeve 51 until the bottom flange 65 rests on the base 53 of the sleeve51. In so assembling the sleeve and the spool the clip projectionsdeform and snap fit secure above the upper flange 66 of the spool 52. Inthis way the spool body 52 is held captive with respect to the sleevebut relative rotation is permitted between the two components. The wirespool 52 is provided with recesses 70 71 on opposed internalcircumferential walls for locating on formations provided on a rotarycapstan device 90 of a mount device 75 as will be described later. Awinding projection 73 is provided on the upper surface 64 of the wirespool 52 enabling hand winding of the spool body 52 with respect to thesleeve 51. The recessed annular wall 67 is provided with a wireinsertion aperture 72 angled to extend completely through the wall andpermitting an end of the wire to be inserted and secured with respect tothe spool body 52. The upper surface 64 is provided with a viewingaperture 76 to enable the insertion aperture to be viewed from above.

The mount device 75 to which the store/dispenser device 50 is mountedfor dispensing the wire is best shown in FIGS. 9 to 11. The mount devicecomprises a releasable suction cup mounts 77 enabling the mount deviceto be releasably secured to the windscreen. The suction cup mountscomprise a rigid plastics cup 82 and underlaying flexible rubber skirtmembrane 83. Actuation/release lever 84 enables consistent suction to beapplied and released. As mentioned previously such suction mounts arecommonly employed in windscreen replacement and repair technology. Onthe opposed side of the mount device 75 to the position occupied by thelever 84 when in the down or engaged position is a moulding 86 whichreceived securing bolts 88 for a mounting platform 89 to which a rotarycapstan 90 is mounted. The mounting platform 89 has a peripheral flangesurface 89 a extending outwardly from the rotary capstan 90 which isgenerally cylindrical in profile and rotationally mounted with respectto the platform 89 by means of a central aperture 91 which is mounted onthe peripheral outer cylindrical surface of a stationary bush 92. Anactuation/release lever 94 pivots about pin fixing 93 and in doing socams against a reaction cap 95 which has a central stem tube 95 a whichis received in a central axial bore of the stationary bush 92. This camaction tends to force the reaction cap 95 downwardly. The bottom end ofthe stem tube 95 a engages against a compression spring 97 to counteractthe downward force and movement of the reaction cap 95 and stem tube 95a.

Effectively therefore the reaction cap is biased upwardly to anequilibrium position by the spring 97. When the lever is moved to itsactuation position (the position shown in FIG. 11) the reaction cap 95and stem tube 95 a move downwardly and the spring becomes compressed. Anaxial rod 99 which is threaded at its lower end 99 a is received in athreaded bore in a receiving boss 100 provided in platform 89. Byrotating the axial rod 99 about its longitudinal axis (by the lever whenorientated in its upright position), the reaction cap 95 and stem tube95 a move upwardly or downwardly with respect to the upper surface 90 aof the rotary capstan 90. A conformable or compression disc 103 (such asfelt disc) is mounted to the underside of the reaction cap 95.

When the lever is moved to its actuation position (the position shown inFIG. 11) the reaction cap 95 and stem tube 95 a move downwardly and thespring becomes compressed. Depending upon the degree to which thereaction cap 95 and stem tube 95 a have move upwardly or downwardly withrespect to the upper surface 90 a of the rotary capstan 90 as a resultof the rotation of the axial rod 99 about its longitudinal axis, thecompression disc 103 (which effectively acts as a brake disc) may eitherbe clear of the upper surface 90 a of the rotary capstan 90, or forcedinto engagement with the upper surface 90 a of the rotary capstan 90,thereby acting as a brake to rotation of the capstan 90 on the platform89. In this way, the dispensing device includes a braking mechanism,which is readily adjustable with respect to the braking force applyingduring paying out of the wire. The degree of braking achieved willdepend upon the degree to which the axial rod has been rotated in theclockwise or counter-clockwise sense. At one extreme there may be nofrictional engagement between the compression disc 103 and the uppersurface 90 a of the rotary capstan 90, in which case the rotary capstancan rotate freely. At the other extreme there will be maximum engagementbetween the compression disc 103 and the upper surface 90 a of therotary capstan 90, in which case the rotary capstan may be preventedfrom rotating at all. In between these two extremes the torque requiredto rotate the capstan will vary depending upon the position of the axialrod 99. As a result it is possible to finely adjust the braking actingon the capstan.

The rotary capstan 75 is provided on opposed circumferential wallportions, with detents 106 107 which are arranged to match up and engagein the recesses 70 71 on opposed internal circumferential walls of thewire spool 52 as the wire store 50 is docked downwardly to rest on theplatform flange 89 a, settling snugly about the outer surface of thecapstan. The engagement recesses 70 71 are shaped to cooperate with thedetents 106 107 such that once engaged the spool 52 is effectivelyrotationally locked with respect to the capstan 75 such that the capstanand the spool 52 rotate in unison (unless rotation is effectivelyinhibited by the braking mechanism earlier described). It should benoted that the housing 51 does not rotate in unison with the capstan andthe spool body 52 ensuring that the dispensing gap between the edges 5556 of the wall 54 remains in position.

However, the engagement between the detents 106 107 and the recesses issuch that the store device 50 can be lifted upwardly clear of thecapstan 90, from the docked position with relatively little manual forceapplied. To this end the engagement formations (either the detents 106107 or the recesses 70 71) are preferably linear formations extendingupwardly/ downwardly with respect to the circumferential walls of thecapstan 90 and the spool 52. The recesses 70 71 preferably compriseslots or channels. The capstan 90 also includes a recess 105 foraccommodating the end portion of the wire that extends through the wireaperture 72 in the store dispenser device 50.

When a store/dispenser device 50 is loaded with wire and secured to themount 75, wire can be drawn from the store/dispenser device 50 and usedin a similar way to the wire store dispenser device 2 as described inrelation to FIGS. 2 to 4. Several advantages are however realised by theinvention over the store dispenser device as described in relation toFIGS. 2 to 4.

Firstly, the wire store 50 can be easily and conveniently demounted fromthe mount 75. This enables the store, with the wire still wound on thespool body 52, to be passed from one side of the windscreen to the otherby prising out the already released corner of the windscreen to form asmall gap and passing the spool through the gap. The required length maythen be payed out from the spool 52 before being cut.

Secondly, the adjustable braking mechanism ensures that the cutting outprocess can be tailored to ensure that wire dispensing is accuratelycontrolled. For example when setting out the wire around the peripheryof the windscreen there are instances at which it is desirable toprevent any further wire from being pulled out from the store/dispenser.At such instances maximum brake force can be applied. At other instancesit is desirable to permit the wire to be dispensed freely and thereforethe brake system can be completely released. At other instances duringthe procedure, for example when slip cutting, some torque resistance isrequired and the present system enables the torque resistance appliedfor slip cutting to be readily adjusted and set to the level desired bythe operator.

The provision of the store/dispenser device 50 having an annular outersleeve 51 and which receives, seated therein, a relatively rotatablespool 52 upon which wire is wound is also advantageous. This providesfor dispensing and or loading of the store device 50 in a controlledmanner and prevents so called ‘birds nesting’ occurring. ‘Birds nesting’occurs when a poorly constrained wound coil of wire springs of a spoolin an uncontrolled manner thereafter becoming tangled, possibly kinkedand difficult to use.

The present invention provides the benefits of wire cutting systemswithout over complex system apparatus arrangements or the need to reconfigure the apparatus significantly following initial set up. Thetechnique can be used by operators of relatively little experience orphysical strength following an initial set up routine of minimalcomplexity.

What is claimed is:
 1. A dispensing system for dispensing cutting wireto be used in a glazing panel cut out procedure, the system comprising:a mounting device arranged to be mounted on a glazing panel, themounting device being provided with rotary means operable to pay outcutting wire from the system, wherein the rotary means is controllableto adjust the applied torque required to operate the rotary means.
 2. Adispensing system according to claim 1, further comprising: adjustablebrake means operable to adjust the applied torque required to operatethe rotary means.
 3. A dispensing system according to claim 2, wherein:the adjustable brake means comprises a friction brake which istightenable to increase the braking effect or relaxable to reduce thebraking effect.
 4. A dispensing system according to claim 1, wherein:the rotary means comprises a rotary device to which a wire store deviceis arranged to be coupled, the system including adjustable brake meansengaging with the rotary device and operable to adjust the appliedtorque required to operate the rotary device.
 5. A dispensing systemaccording to claim 4, wherein: the adjustable brake means is operated bya cam and lever.
 6. A dispensing system according to claim 1, wherein:the mounting device is provided with a docking station for docking awire store device.
 7. A dispensing system according to claim 6, wherein:the wire store device is arranged to be mounted on the docking stationin order to dispense wire.
 8. A dispensing system according to claim 6,wherein: the wire store device is demountable from the docking station.9. A dispensing system according to claim 6, wherein: the dockingstation is provided with said rotary means.